webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 147 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/mathml/MathMLStyle.cpp b/Source/WebCore/rendering/mathml/MathMLStyle.cpp
new file mode 100644
index 000000000..6162acbb9
--- /dev/null
+++ b/Source/WebCore/rendering/mathml/MathMLStyle.cpp
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2016 Igalia S.L. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "MathMLStyle.h"
+
+#if ENABLE(MATHML)
+
+#include "MathMLElement.h"
+#include "MathMLNames.h"
+#include "RenderMathMLBlock.h"
+#include "RenderMathMLFraction.h"
+#include "RenderMathMLMath.h"
+#include "RenderMathMLRoot.h"
+#include "RenderMathMLScripts.h"
+#include "RenderMathMLToken.h"
+#include "RenderMathMLUnderOver.h"
+
+namespace WebCore {
+
+using namespace MathMLNames;
+
+Ref<MathMLStyle> MathMLStyle::create()
+{
+    return adoptRef(*new MathMLStyle());
+}
+
+const MathMLStyle* MathMLStyle::getMathMLStyle(RenderObject* renderer)
+{
+    // FIXME: Should we make RenderMathMLTable derive from RenderMathMLBlock in order to simplify this?
+    if (is<RenderMathMLTable>(renderer))
+        return &downcast<RenderMathMLTable>(*renderer).mathMLStyle();
+    if (is<RenderMathMLBlock>(renderer))
+        return &downcast<RenderMathMLBlock>(*renderer).mathMLStyle();
+    return nullptr;
+}
+
+void MathMLStyle::resolveMathMLStyleTree(RenderObject* renderer)
+{
+    for (auto* child = renderer; child; child = child->nextInPreOrder(renderer)) {
+        // FIXME: Should we make RenderMathMLTable derive from RenderMathMLBlock in order to simplify this?
+        if (is<RenderMathMLTable>(child))
+            downcast<RenderMathMLTable>(*child).mathMLStyle().resolveMathMLStyle(child);
+        else if (is<RenderMathMLBlock>(child))
+            downcast<RenderMathMLBlock>(*child).mathMLStyle().resolveMathMLStyle(child);
+    }
+}
+
+RenderObject* MathMLStyle::getMathMLParentNode(RenderObject* renderer)
+{
+    auto* parentRenderer = renderer->parent();
+
+    while (parentRenderer && !(is<RenderMathMLTable>(parentRenderer) || is<RenderMathMLBlock>(parentRenderer)))
+        parentRenderer = parentRenderer->parent();
+
+    return parentRenderer;
+}
+
+void MathMLStyle::updateStyleIfNeeded(RenderObject* renderer, bool oldDisplayStyle, MathMLElement::MathVariant oldMathVariant)
+{
+    if (oldDisplayStyle != m_displayStyle) {
+        renderer->setNeedsLayoutAndPrefWidthsRecalc();
+        if (is<RenderMathMLToken>(renderer))
+            downcast<RenderMathMLToken>(renderer)->updateTokenContent();
+        else if (is<RenderMathMLFraction>(renderer))
+            downcast<RenderMathMLFraction>(renderer)->updateFromElement();
+    }
+    if (oldMathVariant != m_mathVariant) {
+        if (is<RenderMathMLToken>(renderer))
+            downcast<RenderMathMLToken>(renderer)->updateTokenContent();
+    }
+}
+
+void MathMLStyle::resolveMathMLStyle(RenderObject* renderer)
+{
+    ASSERT(renderer);
+
+    bool oldDisplayStyle = m_displayStyle;
+    MathMLElement::MathVariant oldMathVariant = m_mathVariant;
+    auto* parentRenderer = getMathMLParentNode(renderer);
+    const MathMLStyle* parentStyle = getMathMLStyle(parentRenderer);
+
+    // By default, we just inherit the style from our parent.
+    m_displayStyle = false;
+    m_mathVariant = MathMLElement::MathVariant::None;
+    if (parentStyle) {
+        setDisplayStyle(parentStyle->displayStyle());
+        setMathVariant(parentStyle->mathVariant());
+    }
+
+    // Early return for anonymous renderers.
+    if (renderer->isAnonymous()) {
+        updateStyleIfNeeded(renderer, oldDisplayStyle, oldMathVariant);
+        return;
+    }
+
+    if (is<RenderMathMLMath>(renderer) || is<RenderMathMLTable>(renderer))
+        m_displayStyle = false; // The default displaystyle of <math> and <mtable> is false.
+    else if (parentRenderer) {
+        if (is<RenderMathMLFraction>(parentRenderer))
+            m_displayStyle = false; // <mfrac> sets displaystyle to false within its numerator and denominator.
+        else if ((is<RenderMathMLRoot>(parentRenderer) && !parentRenderer->isRenderMathMLSquareRoot()) || is<RenderMathMLScripts>(parentRenderer) || is<RenderMathMLUnderOver>(parentRenderer)) {
+            // <mroot>, <msub>, <msup>, <msubsup>, <mmultiscripts>, <munder>, <mover> and <munderover> elements set displaystyle to false within their scripts.
+            auto* base = downcast<RenderBox>(parentRenderer)->firstChildBox();
+            if (renderer != base)
+                m_displayStyle = false;
+        }
+    }
+
+    // The displaystyle and mathvariant attributes override the default behavior.
+    auto* element = downcast<RenderElement>(renderer)->element();
+    if (is<MathMLElement>(element)) {
+        std::optional<bool> displayStyle = downcast<MathMLElement>(element)->specifiedDisplayStyle();
+        if (displayStyle)
+            m_displayStyle = displayStyle.value();
+        std::optional<MathMLElement::MathVariant> mathVariant = downcast<MathMLElement>(element)->specifiedMathVariant();
+        if (mathVariant)
+            m_mathVariant = mathVariant.value();
+    }
+    updateStyleIfNeeded(renderer, oldDisplayStyle, oldMathVariant);
+}
+
+}
+
+#endif // ENABLE(MATHML)